Abstract: An optical touch screen including a display surface, an optical illumination assembly arranged along at least part of a periphery of the display surface, at least one light detector arranged to detect light distribution produced by the optical illumination assembly and changes in the light distribution produced by the presence of an object in predetermined propinquity to the display surface, detection circuitry receiving at least one output from the at least one light detector and providing an output indication of a two-dimensional location of the object relative to the display surface, calibration functionality responsive to changes in light distribution other than changes produced by the presence of an object in predetermined propinquity to a region of the display surface for calibrating the detection circuitry, at least one auxiliary illumination source, and at least one partially transmissive, partially reflective optical element disposed along a light path to the at least one light detector, providing a

Abstract: A touch panel including a generally planar surface, at least two illuminators, for illuminating a sensing plane generally parallel to the generally planar surface, at least one selectably actuable reflector operative, when actuated, to reflect light from at least one of the at least two illuminators, at least one sensor for generating an output based on sensing light in the sensing plane and a processor which receives the output from the at least one sensor, and provides a touch location output indication.

Abstract: An optical touch screen including a display surface, an optical illumination assembly arranged along at least part of a periphery of the display surface, at least one light detector arranged to detect light distribution produced by the optical illumination assembly and changes in the light distribution produced by the presence of an object in predetermined propinquity to the display surface, detection circuitry receiving at least one output from the at least one light detector and providing an output indication of a two-dimensional location of the object relative to the display surface, calibration functionality responsive to changes in light distribution other than changes produced by the presence of an object in predetermined propinquity to a region of the display surface for calibrating the detection circuitry, at least one auxiliary illumination source, and at least one partially transmissive, partially reflective optical element disposed along a light path to the at least one light detector, providing a

Abstract: A precision polishing system able to polish samples to an accuracy within the submicron range is disclosed. The novel polishing system has applications in the semiconductor field for use in polishing silicon wafers during testing and quality control inspections. In the examination of failed wafers during the semiconductor manufacturing process, it is desirable to examine a cross section of the wafer at the point of failure. The polishing system of the present invention enables very accurate polishing of the wafer down to the submicron accuracy range. The sample is held is place by a gripper assembly which is attached to a polishing arm slideably connected to a fixed rail. The polishing arm is raised and lowered to polish the sample using a polishing wheel covered with a suitable abrasive. A video microscope attached to an object lens and a video camera provide images that are processed to control the polishing operation.